The Riverside County district attorney's office is seeking the death penalty against Kevin Cox, 25; Tyrone Miller, 25; and Emrys John, 22.

A fourth former Marine, Kesaun Sykes, 25, also faces the death penalty but will be tried separately, the district attorney's office said. All four have pleaded not guilty.

Prosecutors said the attackers stormed the couple's home in the French Valley neighborhood in southern Riverside County as part of a robbery scheme.

Pietrzak, an Iraq war veteran, was stationed at Miramar Marine Corps Air Station in San Diego. His wife was a counselor with a Riverside County infant care program. They had been married for two months.